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dc.contributor.authorCarbone, Simona
dc.contributor.authorDinning, Phillip
dc.contributor.authorCosta, Marcello
dc.contributor.authorSpencer, Nicholas John
dc.contributor.authorBrookes, Simon Jonathan
dc.contributor.authorWattchow, David Anthony
dc.date.accessioned2013-08-26T04:52:35Z
dc.date.available2013-08-26T04:52:35Z
dc.date.issued2013-05-01
dc.identifier.citationCarbone, S.E., Dinning, P.G., Costa, M., Spencer, N.J., Brookes, S.J.H. and Wattchow, D.A., 2013.  Ascending excitatory neural pathways modulate slow phasic myogenic contractions in the isolated human colon.  Neurogastroenterology and Motility, 25(8), 670-676.en
dc.identifier.issn1350-1925
dc.identifier.urihttp://hdl.handle.net/2328/26993
dc.descriptionThis is the accepted version of the following article: [Carbone, S. E., Dinning, P. G., Costa, M., Spencer, N. J., Brookes, S. J. H. and Wattchow, D. A. (2013), Ascending excitatory neural pathways modulate slow phasic myogenic contractions in the isolated human colon. Neurogastroenterology & Motility, 25: 670–e510.], which has been published in final form at [http://dx.doi.org/10.1111/nmo.12129]. In addition, authors may also transmit, print and share copies with colleagues, provided that there is no systematic distribution of the submitted version, e.g. posting on a listserve, network or automated delivery.en
dc.description.abstractBackground In animal models, enteric reflex pathways have potent effects on motor activity; their roles have been much less extensively studied in human gut. The aim of this study was to determine if ascending excitatory interneuronal pathways can modulate spontaneous phasic contractions in isolated preparations of human colonic circular muscle. Methods Human colonic preparations were cut into T shapes, with vertical bar of the ‘T’ pharmacologically isolated. Electrical stimulation and the nicotinic agonist, 1,1-dimethyl-4-phenylpiperazinium iodide (DMPP), were applied to the isolated region and circular muscle contractile activity was measured from the cross-bar of the T, more than 10 mm orally from the region of stimulation. Key Results The predominant form of spontaneous muscle activity consisted of tetrodotoxin-resistant, large amplitude, slow phasic contractions (SPCs), occurring at average intervals of 124 ± 68 s. Addition of a high concentration of hexamethonium (1 mmol L-1) to the superfusing solution significantly increased the interval between SPCs to 278.1 ± 138.3 s (P < 0.005). Focal electrical stimulation more than 10 mm aboral to the muscle recording site advanced the onset of the next SPC, and this effect persisted in hexamethonium. However, the effect of electrical stimulation was blocked by tetrodotoxin (TTX, 1 µmol L-1). Application of the nicotinic agonist DMPP (1 mmol L-1) to the aboral chamber often stimulated a premature SPC (n = 4). Conclusions & Inferences The major form of spontaneous contractility in preparations of human colonic circular muscle is SPCs, which are myogenic in origin. Activation of ascending excitatory neural pathways, which involve nicotinic receptors, can modulate the timing of SPCs and thus influence human colonic motility.en
dc.description.sponsorshipAustralian National Health & Medical Research Councilen
dc.language.isoen
dc.publisherWiley-Blackwellen
dc.relationhttp://purl.org/au-research/grants/nhmrc/595980en
dc.relationhttp://purl.org/au-research/grants/nhmrc/630502en
dc.relationhttp://purl.org/au-research/grants/nhmrc/595979en
dc.relationhttp://purl.org/au-research/grants/nhmrc/1025766en
dc.rightsCopyright 2013 John Wiley & Sons Ltden
dc.subjectNeural pathwaysen
dc.subjectGastrointestinal motilityen
dc.titleAscending excitatory neural pathways modulate slow phasic myogenic contractions in the isolated human colonen
dc.typeArticleen
dc.relation.grantnumberNHMRC/595980en
dc.relation.grantnumberNHMRC/630502en
dc.relation.grantnumberNHMRC/1025766en
dc.relation.grantnumberNHMRC/595979en
dc.identifier.doihttps://doi.org/10.1111/nmo.12129en
dc.rights.holderWiley-Blackwellen
dc.rights.licenseIn Copyright
local.contributor.authorOrcidLookupBrookes, Simon Jonathan: https://orcid.org/0000-0001-5635-0876en_US
local.contributor.authorOrcidLookupCosta, Marcello: https://orcid.org/0000-0003-1817-0158en_US


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